310T Drivetrain and Transmission 2

Question 1

A Class 8 truck exhibits a harsh 1-2 upshift in an Allison automatic transmission. What is the MOST likely cause?

Accepted Answer

Faulty turbine speed sensor

Answer

Low transmission fluid level

Answer

Worn torque converter clutch

Answer

Clogged transmission cooler line

Question 2

When performing a stall test on a torque converter, what does a stall speed BELOW the manufacturer's specification indicate?

Accepted Answer

Low engine power or a seized stator

Answer

Slipping clutch packs inside the transmission

Answer

A faulty torque converter stator one-way clutch

Answer

Excessive transmission fluid pressure

Question 3

Which component in a standard Spicer-style driveshaft prevents vibration caused by the angularity of universal joints?

Accepted Answer

Phased yokes

Answer

Slip yoke

Answer

Companion flange

Answer

Grease fitting

Question 4

A truck technician is diagnosing a manual transmission that pops out of fifth gear under load. What is the MOST probable cause?

Accepted Answer

Worn detent balls and springs

Answer

Worn shift fork

Answer

Worn or damaged synchronizer blocker ring

Answer

Excessive mainshaft end play

Question 5

In a tandem drive axle bogie, what is the purpose of the interaxle differential lock?

Accepted Answer

It couples both axle input shafts to distribute torque equally regardless of traction

Answer

It prevents wheel spin on both drive axles simultaneously

Answer

It locks the ring gear to the axle housing

Answer

It increases the gear ratio between the two axles

Question 6

Which type of lubricant is typically specified for a Meritor-style hypoid rear axle?

Accepted Answer

SAE 75W-140 GL-5 gear oil

Answer

SAE 80W-90 GL-4 gear oil

Answer

Dexron ATF

Answer

SAE 30 engine oil

Question 7

A technician notices the speedometer reads higher than actual vehicle speed on a truck that recently had larger tires installed. What drivetrain calibration is required?

Accepted Answer

Reprogram the vehicle speed sensor (VSS) pulse count in the ECM

Answer

Recalibrate the ABS module ring gear tooth count

Answer

Adjust the rear axle gear ratio

Answer

Install a new driveshaft speed sensor